Revert "Avoid conflict with VTK for H5cpp.h"

This reverts commit d4bffcbab97129ac001f128ff1e4f324a49b1be2.
Revert "External HDF5 dirs in STATISMO_INCLUDE_DIRS"

This reverts commit a3f0b791a0ea4127f3185eb203389133c6841eac.